[SCSI] zalon: fix oops on attach failure

I recently discovered on my zalon that if the attachment fails because
of a bus misconfiguration (I scrapped my HVD array, so the card is now
unterminated) then the system oopses.  The reason is that if
ncr_attach() returns NULL (signalling failure) that NULL is passed by
the goto failed straight into ncr_detach() which oopses.

The fix is just to return -ENODEV in this case.

Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/zalon.c

@@ -134,7 +134,7 @@ zalon_probe(struct parisc_device *dev)
 
 	host = ncr_attach(&zalon7xx_template, unit, &device);
 	if (!host)
-		goto fail;
+		return -ENODEV;
 
 	if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
 	  dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",